MD5 哈希 和 JSON

 /// <summary> 

         /// 计算字符串的 MD5 哈希。若字符串为空，则返回空，否则返回计算结果。 

         /// </summary> 

         public static string ComputeMD5Hash( this string str ) 

         { 

             string hash = str; 

   

             if ( str != null ) 

             { 

                 MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); 

                 byte[] data = Encoding.ASCII.GetBytes( str ); 

                 data = md5.ComputeHash( data ); 

                 hash = ""; 

                 for ( int i = 0; i < data.Length; i++ ) 

                     hash += data[ i ].ToString( "x2" ); 

             } 

   

             return hash; 

         } 

         /// <summary> 

         /// 获得 Json 描述的 .Net 对象 

         /// </summary> 

         public static T JsonToObject<T>( this string str ) 

         { 

             return new JavaScriptSerializer().Deserialize<T>( str ); 

         } 

   

   

 //object extensions 

 /// <summary> 

         /// 获得 obj 的 JSON 字符串 

         /// </summary> 

         public static string ToJson( this object obj ) 

         { 

             return new JavaScriptSerializer().Serialize( obj ); 

         } 

//sample 

   

 public class Student 

 { 

     public string Name { get; set; } 

     public int Age { get; set; } 

 } 

   

 Student std = new Student() { Name = "xxxx", Age = 24 }; 

 std.ToJson();   //   =>  "\{ \"Name\": \"xxxx\", \"Age\": 24 \}" 

  

 string json = "\{ \"Name\": \"xxxx\", \"Age\": 24 \}"; 

 Student s = json.JsonToObject<Student>();